package com.ly.mpayment.core.util;

import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class XssShieldUtil {
	  private static List<Pattern> patterns = null;

	    private static List<Object[]> getXssPatternList() {
	        List<Object[]> ret = new ArrayList<Object[]>();

	        ret.add(new Object[]{"<(no)?script[^>]*>.*?</(no)?script>", Pattern.CASE_INSENSITIVE});
	        ret.add(new Object[]{"eval\\((.*?)\\)", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL});
	        ret.add(new Object[]{"expression\\((.*?)\\)", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL});
	        ret.add(new Object[]{"(javascript:|vbscript:|view-source:)*", Pattern.CASE_INSENSITIVE});
	        ret.add(new Object[]{"<(\"[^\"]*\"|\'[^\']*\'|[^\'\">])*>", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL});
	        ret.add(new Object[]{"(window\\.location|window\\.|\\.location|document\\.cookie|document\\.|alert\\(.*?\\)|window\\.open\\()*", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL});
	        ret.add(new Object[]{"<+\\s*\\w*\\s*(oncontrolselect|oncopy|oncut|ondataavailable|ondatasetchanged|ondatasetcomplete|ondblclick|ondeactivate|ondrag|ondragend|ondragenter|ondragleave|ondragover|ondragstart|ondrop|onerror=|onerroupdate|onfilterchange|onfinish|onfocus|onfocusin|onfocusout|onhelp|onkeydown|onkeypress|onkeyup|onlayoutcomplete|onload|onlosecapture|onmousedown|onmouseenter|onmouseleave|onmousemove|onmousout|onmouseover|onmouseup|onmousewheel|onmove|onmoveend|onmovestart|onabort|onactivate|onafterprint|onafterupdate|onbefore|onbeforeactivate|onbeforecopy|onbeforecut|onbeforedeactivate|onbeforeeditocus|onbeforepaste|onbeforeprint|onbeforeunload|onbeforeupdate|onblur|onbounce|oncellchange|onchange|onclick|oncontextmenu|onpaste|onpropertychange|onreadystatechange|onreset|onresize|onresizend|onresizestart|onrowenter|onrowexit|onrowsdelete|onrowsinserted|onscroll|onselect|onselectionchange|onselectstart|onstart|onstop|onsubmit|onunload)+\\s*=+", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL});
	        return ret;
	    }

	    private static List<Pattern> getPatterns() {

	        if (patterns == null) {

	            List<Pattern> list = new ArrayList<Pattern>();

	            String regex = null;
	            Integer flag = null;
	            int arrLength = 0;

	            for(Object[] arr : getXssPatternList()) {
	                arrLength = arr.length;
	                for(int i = 0; i < arrLength; i++) {
	                    regex = (String)arr[0];
	                    flag = (Integer)arr[1];
	                    list.add(Pattern.compile(regex, flag));
	                }
	            }

	            patterns = list;
	        }

	        return patterns;
	    }

	    public static String stripXss(String value) {
	        if(!StringUtils.isBlank(value)) {

	            Matcher matcher = null;

	            for(Pattern pattern : getPatterns()) {
	                matcher = pattern.matcher(value);
	                // 匹配
	                if(matcher.find()) {
	                    // 删除相关字符串
	                    value = matcher.replaceAll("");
	                }
	            }

	            value = value.replaceAll("<", "&lt;").replaceAll(">", "&gt;");
	        }

//	      if (LOG.isDebugEnabled())
//	          LOG.debug("strip value: " + value);

	        return value;
	    }	
}
